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"Reference" TDA1541A DAC with I2S-BUS architecture
"Reference" TDA1541A DAC with I2S-BUS architecture
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Old 26th September 2010, 07:48 AM   #101
dvb projekt is offline dvb projekt  Germany
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"Reference" TDA1541A DAC with I2S-BUS architecture
In my system i donīt use the bypass caps, because my Fairchild Stealth Diodes have a extreme soft recovery and donīt produce much HF noise.
Also we have the shunt regīs. in the lines.

I think you should try it by yourself in your system with and without the 0,1ĩF caps.
Perhaps you could post your experiences.
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Old 26th September 2010, 11:32 AM   #102
gabanyayaya is offline gabanyayaya  Malaysia
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Quote:
Originally Posted by dvb-projekt View Post
In my system i donīt use the bypass caps, because my Fairchild Stealth Diodes have a extreme soft recovery and donīt produce much HF noise.
Also we have the shunt regīs. in the lines.

I think you should try it by yourself in your system with and without the 0,1ĩF caps.
Perhaps you could post your experiences.
Yes I will. Since I'm using DSEP-12A I guess it can be omitted.
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Old 26th September 2010, 12:01 PM   #103
LucasAdamson is offline LucasAdamson  United Kingdom
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Oliver,

Could you explain the use of TL431ACLP for me please. I see that the Salas reg boards you sell, are described as "pre" shunt regulators, implying that the real regulation goes on at the TLA1541A board, and the TL431ACLP suggests this too, but I don't understand it.

Could you clarify for me please, especially as I am hoping to use Hypnotise Blue Edition boards for this build, and I want to get it right.

Many thanks
Lucas
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Old 26th September 2010, 02:26 PM   #104
dvb projekt is offline dvb projekt  Germany
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"Reference" TDA1541A DAC with I2S-BUS architecture
Hi Lucas,

the TL431 for each powerline on the TDA1541A DAC module are a recommendation from Thorsten Loesch
in the development of the complete project.

If you only use one DAC module you can also try to skip the onboard regs
and connect the salas shunts direct to the output pin of the TL431.
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Old 26th September 2010, 04:22 PM   #105
LucasAdamson is offline LucasAdamson  United Kingdom
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OK, so for a single non-paralleled DAC, I should probably skip them and get lower jitter. Then if I decide to add another chip, I can introduce some TL431s.

I'm not entirely convinced of the idea of paralleling chips, even though some of the top CD players have done this, and Thorsten seems to be unconvinced too. Lukas of Lampizator is a fan though, so who knows? I'll try a single chip - it's certainly cheaper!
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Old 26th September 2010, 05:56 PM   #106
dvb projekt is offline dvb projekt  Germany
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"Reference" TDA1541A DAC with I2S-BUS architecture
Quote:
Originally Posted by LucasAdamson View Post
OK, so for a single non-paralleled DAC, I should probably skip them and get lower jitter.
The statement from Thorsten about the jitter counts to the I2S input with or without buffer ICīs, not to the power lines
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Old 26th September 2010, 07:49 PM   #107
LucasAdamson is offline LucasAdamson  United Kingdom
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Sorry, I was referring to what Salas said at the foot of the page about the comparison between the Salas and the TL431.

I erroneously used the word "jitter" in place of "noise" as I was distracted by the noise of my 4 year old hassling me at the time.

When it comes to shunt regs, I do trust Salas' advice as he has devoted such a considerable amount of effort on developing them, and they are highly celebrated, so I think I will skip the TL431, and any associated shunt-reg parts after the Salas. With a bank of smoothing caps the Salas alone should be superior to any supply in any commercial TDA1541A CD player, no?
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Old 27th September 2010, 05:09 AM   #108
dvb projekt is offline dvb projekt  Germany
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"Reference" TDA1541A DAC with I2S-BUS architecture
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Originally Posted by LucasAdamson View Post
With a bank of smoothing caps the Salas alone should be superior to any supply in any commercial TDA1541A CD player, no?
Absolutely, yes !
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Old 27th September 2010, 08:30 AM   #109
LucasAdamson is offline LucasAdamson  United Kingdom
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Do you know how many mA the single TDA1541A board pulls, as I need to add at least 100mA or preferably a bit more to keep the mosfets usefully occupied.
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Old 27th September 2010, 08:42 AM   #110
dvb projekt is offline dvb projekt  Germany
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"Reference" TDA1541A DAC with I2S-BUS architecture
I would recommed to set the 3 shunt lines with a 10R to ~200mA each.
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